I just confirmed that the opposite-sideband image is way down. I believe John was hearing the effect of the notch at 1500 Hz, which is a characteristic of Weaver demodulation. When you inject a carrier and sweep through the SSB passband, the existence of the notch can make it appear that you're hearing both desired and image signals -- but what you're really hearing is just the tone at different pitches on either side of the notch.
73, Wayne N6KR > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Wayne Burdick > Sent: Sunday, August 18, 2013 6:19 PM > To: John_N1JM > Cc: [email protected] > Subject: Re: [Elecraft] KX3 firmware update (12-kHz audio spur fixed, etc.) > > Interesting. Well, I and a number of other testers have noted better > fidelity, and the op who had measured the in-band OSB image at 20 dB > reported that it had dropped significantly. > > I've been listening to music in the AM broadcast band in SSB mode with FL2 > engaged, and it sounds quite clean. > > 73, > Wayne > N6KR > > > On Aug 18, 2013, at 4:03 PM, John_N1JM <[email protected]> wrote: > >> No improvement here that I can detect in the weaver demod fix. >> 73,John N1JM >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
